Re: [Qemu-devel] [RFC 2/3] pci: Link pci_host_bridges with QTAILQ

[Marcel Apfelbaum]

Hi Zihan,

On 05/22/2018 08:59 AM, Zihan Yang wrote:
> >  have no objection here, we'll see later how the modification helps.
>
> The purpose is to place the q35 host at the start of queue. In the 
> original QLIST,
> when a new pxb host is added, q35 host will be bumped to the end end list.
>
> By replacing it with QTAILQ, we can always get q35 host bridges first, 
> so that
> we can make sure q35 host stays in pci domain 0. If there is no pxb host,
> the code needs not change because the 'next' field will be NULL.

We can use the pxb list we keep, but I don't see an issue here.

> I'm not sure whether it is necessary to let q35 host reside in pci 
> domain 0,
> but I think I'd better reserve the original when I don't know the 
> potential impact.

Q35 should always reside in PCI domain 0.

Thanks,
Marcel

> Thanks
> Zihan